On hypercyclic rank one perturbations of unitary operators

Anton Baranov, Vladimir Kapustin and Andrei Lishanskii

Mathematische Nachrichten, 2019, vol. 292, issue 5, 961-968

Abstract: Recently, S. Grivaux showed that there exists a rank one perturbation of a unitary operator in a Hilbert space which is hypercyclic. Another construction was suggested later by the first and the third authors. Here, using a functional model for rank one perturbations of singular unitary operators, we give yet another construction of hypercyclic rank one perturbation of a unitary operator. In particular, we show that any countable union of perfect Carleson sets on the circle can be the spectrum of a perturbed (hypercyclic) operator.

Date: 2019
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